workflows: add packages for unpacking test cases
workflows: add packages for unpacking test cases

Newly-added test cases won't be in the frozen archive yet and we'll
have to unpack them in the traditional way.

Signed-off-by: Benjamin Gilbert <55d1d0083477f6dd5757d8929dd3b9e09d80bd84@cs.cmu.edu>

openslide/openslide,openslide/openslide,openslide/openslide,openslide/openslide